1387945 has 16 divisors (see below), whose sum is σ = 1818432. Its totient is φ = 1010880.

The previous prime is 1387943. The next prime is 1387961. The reversal of 1387945 is 5497831.

It is not a de Polignac number, because 1387945 - 2¹ = 1387943 is a prime.

It is a d-powerful number, because it can be written as 1 + 3 + 8⁵ + 7⁷ + 9⁶ + 4³ + 5³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8434 + ... + 8596.

It is an arithmetic number, because the mean of its divisors is an integer number (113652).

2^1387945 is an apocalyptic number.

It is an amenable number.

1387945 is a deficient number, since it is larger than the sum of its proper divisors (430487).

1387945 is a wasteful number, since it uses less digits than its factorization.

1387945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312.

The product of its digits is 30240, while the sum is 37.

The square root of 1387945 is about 1178.1107757762. The cubic root of 1387945 is about 111.5468778063.

It can be divided in two parts, 13879 and 45, that added together give a square (13924 = 118²).

The spelling of 1387945 in words is "one million, three hundred eighty-seven thousand, nine hundred forty-five".